New records of fishes ( Actinopterygii : Ostariophysi ) from the Upper Tapajós River Basin

Since freshwater fishes are embedded within a terrestrial landscape that limits dispersal within and among drainage basins it can provide unique opportunities for the identification of distribution patterns, which may reflect continental changes and biogeographical patterns (Berra 2007; Olden et al. 2010). The Neotropical freshwater ichthyofauna is the most diverse of the world (Reis et al. 2003) and the distribution of most species remain unclear. Located in the Brazilian Shield and with 1,784 km length, the Tapajós River is a large southern tributary of the Amazon River (Costa 2007). The Upper Tapajós drainage is defined as the region upstream the confluence of the Teles Pires and Juruena rivers (Bertaco and Garutti 2007). As part of a general taxonomic revision of fish species from the Upper Juruena River, we have been examining the fish collection from this region deposited at LIRP (Laboratório de Ictiologia de Ribeirão Preto), São Paulo, Brazil. Sartor aff. elongatus measurements were summarized in Table 1 and follow Santos and Jégu (1987) with the exclusion of interdosal distance, head height, snout height, and snout width. In this paper we report the first record of one genus and one species of fish for the Upper Tapajós River Basin. Fishes were collected under SEMA (Secretaria de Estado do Meio Ambiente Mato Grosso) permit # 11/2010.

Since freshwater fishes are embedded within a terrestrial landscape that limits dispersal within and among drainage basins it can provide unique opportunities for the identification of distribution patterns, which may reflect continental changes and biogeographical patterns (Berra 2007;Olden et al. 2010).The Neotropical freshwater ichthyofauna is the most diverse of the world (Reis et al. 2003) and the distribution of most species remain unclear.
Located in the Brazilian Shield and with 1,784 km length, the Tapajós River is a large southern tributary of the Amazon River (Costa 2007).The Upper Tapajós drainage is defined as the region upstream the confluence of the Teles Pires and Juruena rivers (Bertaco and Garutti 2007).As part of a general taxonomic revision of fish species from the Upper Juruena River, we have been examining the fish collection from this region deposited at LIRP (Laboratório de Ictiologia de Ribeirão Preto), São Paulo, Brazil.Sartor aff.elongatus measurements were summarized in Table 1 and follow Santos and Jégu (1987) with the exclusion of interdosal distance, head height, snout height, and snout width.In this paper we report the first record of one genus and one species of fish for the Upper Tapajós River Basin.Fishes were collected under SEMA (Secretaria de Estado do Meio Ambiente -Mato Grosso) permit # 11/2010.

Order Characiformes Anostomidae
Sartor aff.elongatus (Figure 1A) Sartor is very rare on collections and only three valid species are recognized.S. elongatus Santos and Jégu, 1987 is reported from the Trombetas River Basin; S. respectus Myers and Carvalho, 1959 from the Upper Xingu River Basin; and S. tucuruiense Santos and Jégu, 1987 from the Tocantins River Basin (Santos and Jégu 1987;Garavello and Britski 2003;Britski and Garavello 2007a).
The nine specimens collected (Appendix 1) in the Upper Juruena River (Figure 2) can be distinguished from S. respectus by having 16 circumpeduncular scales (vs.12).

Abstract:
The first report of Sartor (Anostomidae) and Tatia intermedia (Auchenipteridae) for the Upper Tapajós River Basin are presented here.Sartor is very rare on collections, and is reported only from the Trombetas, Tocantins and Upper Xingu river basins.Tatia intermedia is registered in the upper reaches of the Araguaia, Tocantins, Xingu, and Capim rivers, tributaries of the lower Amazon River in Brazil, northwards to the Suriname coastal rivers and the Essequibo River in Guyana.
Fernando C. P. Dagosta1,2* , Murilo N. L. Pastana 1 and André L. H. Esguícero 1 New records of fishes (Actinopterygii: Ostariophysi) from the Upper Tapajós River Basin It differs from S. tucuruiense by body depth (18.1-19.8 vs. 23-25.9% of SL), caudal peduncle length (15-18.1 vs. 18.5-20% of SL), caudal peduncle depth .Despite the sharing of an elongated and thin body (up to 23% and 15.7% in SL, respectively) with S. elongatus, the specimens from Juruena River are distinguished from Sartor elongatus by the caudal peduncle length (15-18.1 vs. 19.2-22.1% of SL), and by the number of dark vertical bands (7-9 vs. 12-16).Santos and Jégu (1987) reported the presence of twelve to sixteen inconspicuous dark vertical bands dorsally on body not reaching the lateral line in S. elongatus.Facing the lack of Sartor elongatus from different life stages to perceive, or not, ontogenetic modifications on color pattern, the presence of only 7-9 dark bands in examined specimens from Juruena River Basin is interpreted as a   The presence of this species on the Upper Tapajós River Basin further extends its distribution.
The description of several species in the last years (e.g.Moreira et al. 2002;Lucena 2003;Britski and Garavello 2005;2007b;Bertaco and Carvalho 2005a, b;2006;Fisch-Muller et al. 2005;Bertaco and Garutti 2007;Bertaco and Malabarba 2007;Lima et al. 2007;Britski and Lima 2008) reveal that the ichthyofauna of the Upper Tapajós River Basin is highly endemic and poorly known.The present work extends the distribution of Sartor aff.elongatus and Tatia intermedia adding these species records for the Upper Tapajós ichthyofauna.